Conciseness

The body is dense and repo-specific with no basic-concept padding, but has minor trims available: the-ipc-contract-audit is referenced twice (intro and 'Integration With Other Skills') and the Guardrails section restates three rules already covered by the Symmetry Checklist. This fits 'efficient; minor instances of over-explanation that could be trimmed' rather than 'every token earns its place'.

Actionability

Guidance is fully concrete: exact file paths (electron/providers/cli-path-env.ts, electron/main/utils/tooling-status.ts), the command 'bun run typecheck', specific grep targets, and real failure signatures like 'env: node: No such file or directory'. As an instruction-only skill, the absence of code examples is not penalized since the guidance is directly executable.

Workflow Clarity

The skill sequences a 7-part checklist ('Run this before considering an adapter change complete') followed by an explicit Verification section with per-condition validation (both providers, GUI launch, probe surface) and expected error outputs. Clear sequence, explicit validation steps, and checklists for a complex process match the top anchor.

Progressive Disclosure

Good structure with clear sections, a file-role table, and one-level-deep references to real repo docs (docs/providers/codex-upgrade-checklist.md, docs/developer/adding-a-provider.md). At ~130 lines, the specialized 'SDK upgrade hygiene' section is content that could be split into a reference file — a minor organization gap that keeps this below the top anchor.

Specificity

'Keep Stave's Claude and Codex provider runtimes in sync' plus a concrete list of surfaces ('executable lookup, env construction, CLI session launch env, tooling status probes') names several specifics, but the core what is a single action with enumerated trigger surfaces — matching 'lists several specific actions; minor gaps' rather than the comprehensive multi-action top anchor.

Completeness

Explicitly answers both what ('Keep Stave's Claude and Codex provider runtimes in sync when editing one of them') and when ('Use when a change touches [specific files]... Trigger on phrases like...') with concrete trigger phrases — exactly the top anchor.

Trigger Term Quality

Comprehensive natural terms including synonyms ('provider runtime', 'claude adapter', 'codex adapter', 'sibling adapter'), env-var names users paste from errors ('PATH env', 'CLAUDE_CONFIG_DIR', 'CODEX_HOME'), and Korean phrases ('어댑터 대칭', '양쪽 프로바이더 확인') — full coverage of how real users would phrase the need.

Distinctiveness Conflict Risk

Anchored to exact file paths (electron/providers/claude-sdk-runtime.ts, electron/providers/codex-app-server-runtime.ts) and provider-specific env vars, giving it a clear niche with minimal overlap risk against neighboring skills.